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地球学报  2002 

甘肃北山榴辉岩的变质历史

Keywords: 榴辉岩,变质历史,北山

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Abstract:

岩相学、矿物化学和变质条件的估算表明,甘肃北山榴辉岩经历了前榴辉岩相(604-678℃、0.89-1.95GPa)、榴辉岩相(700-720℃、1.2-1.5GPa)、角闪岩相(629℃、0.63-0.83GPa)和绿片岩相(约400℃、0.3-0.4GPa)4个演化阶段。这一P-T轨迹证明北山榴辉岩是塔里木板块与哈萨克斯坦板块在俯冲-碰撞过程中地壳增厚作用的产物。

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